To enjoin is to issue an urgent and official order. If the government tells loggers to stop cutting down trees, they are enjoining the loggers to stop.

Enjoin looks like it should mean bring together, and at one time, it did have that meaning. But in current usage, the only thing enjoin brings together is a command and the person on the receiving end of that order. If your doctor enjoins you to stop smoking, he is suggesting strongly that you quit.

Definitions of enjoin
  1. verb
    give instructions to or direct somebody to do something with authority
    synonyms: order, say, tell
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    command with authority
    give instructions or directions for some task
    command, require
    make someone do something
    call, send for
    order, request, or command to come
    ask to go away
    instruct or command with authority
    instruct (a jury) about the law, its application, and the weighing of evidence
    burden, charge, saddle
    impose a task upon, assign a responsibility to
    make a formal request for official services
    cite, summon, summons
    call in an official matter, such as to attend court
    call, summon, or alert with a beeper
    call back, recall
    summon to return
    call in
    summon to a particular activity or employment
    call to stop the hunt or to retire, as of hunting dogs
    call to duty, military service, jury duty, etc.
    disallow, forbid, interdict, nix, prohibit, proscribe, veto
    command against
    call for
    ask to come
    printing: direct that a matter marked for omission or correction is to be retained (used in the imperative)
    call up, mobilise, mobilize, rally
    call to arms; of military personnel
    type of:
    ask (a person) to do something
  2. verb
    issue an injunction
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